PROBLEM TO BE SOLVED: To provide a simplified and miniaturized plant cultivation device usable for cultivating various kinds of plants.SOLUTION: This plant cultivation device includes cooling or heating a cultivation nutrient solution L by a heat source means N to heat exchanging the cultivation nutrient solution with a space adjusting gas G by a heat exchange means 15 for adjusting the gas temperature, supplying the cultivation nutrient solution L after heat exchange to a cultivation tank 4, and supplying the space adjusting gas G after heat exchange to a cultivation space (cultivation area 6a) on the cultivation tank 4.【課題】植物栽培装置を簡素化及び小型化する。【解決手段】栽培養液Ｌを熱源手段Ｎで冷却又は加熱して気体調温用の熱交換手段１５で空間調整気体Ｇと熱交換させ、熱交換後の栽培養液Ｌを栽培槽４に供給し、熱交換後の空間調整気体Ｇを栽培槽４上の栽培空間（栽培領域６ａ）に供給する。【選択図】図７
